The men who cops say gunned down Young Dolph are in custody ... after a manhunt which resulted in their arrests.
23-year-old Justin Johnson was taken in by U.S. Marshals Officers Tuesday in Indiana, he's wanted on a slew of charges out of Memphis ... including first-degree murder. 32-year-old Cornelius Smith was also booked on a first-degree murder charge Tuesday, but unclear if the Marshals or Memphis PD got him.
As we reported ... cops announced Wednesday Johnson was wanted for murdering Young Dolph ... and Johnson went on social media Saturday to announce plans to turn himself in come Monday ... which he didn't do.
Johnson, who claims he is innocent, was on the Tennessee Bureau of Investigation's Most Wanted list ... and law enforcement says he has ties to organized crime. Smith has not yet made a public statement about his involvement in the murder.
Johnson's a Memphis-area rapper who goes by the name Straight Drop ... and he appears to have shot a music video back in the day at the same home where cops retrieved what they believe is the getaway car used the day Dolph was shot and killed.